[R] Writing a .pdf file within a function - what do I need to return()?

[Dgnn]

I am trying to write a function that generates one PDf containing plots from
several .csv files within a directory.  When I manually execute the code it
seems to work, but not when it is a function. I think I need to return()
something, but haven't had much luck figuring out what/how.

plot.isi<-function(csv.path="~/project/csv by cell") { 
	csv.files<-grep('.csv', list.files(path = csv.path, full.names=T), value=T)
	pdf(file='plots/isi plots.pdf', width=10, height=8)
	#par(mfrow=c(2,1)) #ideally 2 plots per page, but will work on details
after fx. works
	for (i in 1:length(csv.files)){
		raw.df<-read.csv(csv.files[i])
		names(raw.df)<-c('t','isi','logic','cond')
		xyplot(isi ~ t, raw.df, ylim=c(0,1500), ylab='isi', xlab='time', 
				main=basename(csv.files[i]))
	}
	dev.off()
}

Thank you all for the help,

Jason Deignan



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